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Old 03-12-2005, 07:50 PM
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700R4 rebuild

Hello All,
I have a 700R4 from a 93 Camaro LT1 that I plan to rebuild soon. I've gathered most of the parts needed to accomplish the overhaul and have studied the manuals and have been reading anything I can find on this and other forums. I feel that I have a good understanding of what needs to be done to complete a stock rebuild however I'm looking for some advise on mods that are necessary for a performance rebuild. The trans is original [65K] but not up to the task since I increased the power output of the engine.[Est 350-375HP] It still shifts OK under light throttle application but the 2-3 shift is weak at higher RPM's [5600+]. I've seen many different examples of mods for the 700R4 and am looking to find a good combination for my application. My parts list is as follows:
ZPAK 3 - 4 clutches
B/W everywhere else with new steels
Hardened pump rings with HD spring
Transgo forward & 3 - 4 springs
Upgraded reverse & TV boost valves
Wide red band
B/W input sprag
B/W low/reverse roller clutch
bushings, bearings & seals
Corvette servo with billet 4th servo
HD sunshell w/torrington bearing

I am going to leave out the 5 factory installed 3 - 4 springs, remove the #8 checkball, flip the 3 - 4 accumulator piston & spring, and block the line bias valve along with modifying the VB & spacer per TransGo's instructions.

Any guidance you provide will be greatly appreciated.
Thanks.
Max

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Old 03-14-2005, 05:05 PM
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Anyone want to help?
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Old 03-14-2005, 07:51 PM
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Quote:
Originally Posted by Rough
Anyone want to help?

==== some folks have no time for the computer on the weekends... sorry for the slow response

Use a drive shell called "the Beast". The torrington style drive shell is weaker unless they are now modifiing the beast shell.

Make sure the reverse input drum is flat where the wide band applies or buy a new drum.

Upgraded boost valves? Too what size?
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Old 03-14-2005, 08:45 PM
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Sorry, I'm just anxious for information. I am referring to the two valves in the TransGo kit. Are they an upgrade or just stock replacements?
Thanks for the response.
Max
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Old 03-14-2005, 09:40 PM
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the TransGo parts will be sufficent for your application. main boost is .500 and the low reverse boost valve ( if included) is usually a .282 ... ( IIRC)

Install the RED line bias valve spring from the TransGo kit. It builds plenty of main line pressure. No need to block the line bias valve.


Watch the install of the low/reverse boost valve, some folks install it upside down..... the valve does not function well like that
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Old 03-15-2005, 06:47 PM
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Again thanks. What about plugging the check ball in the input drum? I read or heard something somewhere about plugging it and drilling a bleed hole in the side of the drum below the 3 - 4 piston seal to help keep the clutches from burning. Also do you think the later steel pistons are a worthwhile upgrade and if so GM or aftermarket?

Max
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Old 03-15-2005, 09:12 PM
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leave the check ball assembly in the drum.

THe check ball assembly in the pump cover for the 3-4 circuit was removed by 1993.

There is already a factory bleed hole below the 3-4 piston in the drum. You might want to stake the steel cup plug in the drum. I've seen these cup plugs blow out

Aluminum FWD apply piston in the aluminum drum are a common failure ( cracks) point. If you use the steel based molded rubber FWD apply piston , you must use the matching over-run steel apply piston in the FWD piston.


Quote:
Originally Posted by Rough
Again thanks. What about plugging the check ball in the input drum? I read or heard something somewhere about plugging it and drilling a bleed hole in the side of the drum below the 3 - 4 piston seal to help keep the clutches from burning. Also do you think the later steel pistons are a worthwhile upgrade and if so GM or aftermarket?

Max
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Old 03-17-2005, 04:52 PM
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OK, thanks again. Is it worthwhile to plug the bleed hole?

Max
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Old 05-01-2005, 05:43 PM
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I have the trans out and torn down, the band and the 3 - 4 clutches are burnt but the rest looks OK. I tested the servo check valve and found that it leaks so I assume that contributed to the band and clutch problem.

Since I have the Trans Go springs to install would it be beneficial to plug the bleed hole in the input drum and if so is there anything else besides the springs that should be done in conjunction with plugging the bleed hole?

Thanks,
Max
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